Abstract
In this current study, the problems caused by hot and cold forging—the two successive manufacturing process of a crimped nut—were investigated and resolved. The forged material is a leaded brass (CuZn39Pb2). Concerning the problem faced during hot forging (stamping), we chose a methodology based on the reproduction of industrial phenomena in laboratory scale. The study of this problem was conducted by micrographic and chemical analyses. For cold forging (crimping), a mechanical and microstructural characterization of the brass was performed in various conditions of heat treatment and shaping. Two items were proven in this study: (1) the use of graphite reduced the oxidation of the brass which was heated at the forging temperature to quarter; and (2) the heat treatment and annealing at 300°C avoided cracking during cold forging.
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